英文關鍵字
gray
background
education
empty
continent
globe
cartography
earth
ocean
topography
map
sphere
planet
geography
world
russian
discovery
model
science
global
closeup
shone
rotate
spin
英文關鍵字
gray
background
education
empty
continent
globe
cartography
earth
ocean
topography
map
sphere
planet
geography
world
russian
discovery
model
science
global
closeup
shone
rotate
spin